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De Morgan's law: (A ∪ B)' =

AA' ∩ B' (de Morgan)
BA' ∪ B'
CA ∩ B
D∅
Answer & Solution
Correct answer: A. A' ∩ B' (de Morgan)
(A ∪ B)' = A' ∩ B'. (A ∩ B)' = A' ∪ B'. De Morgan's laws. Complement of union = intersection of complements.
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